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ex2_77_test.scm
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ex2_77_test.scm
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;; SICP Tests 2.77 -- put/get
(test-case "Ex 2.77 -- put/get"
(put 'op '(t1 t2) 'value)
(assert-equal 'value (get 'op '(t1 t2) ))
(assert-false (get 'op '(tx) )))
(test-case "Ex 2.77 -- Tagging"
(let ((data (attach-tag 'the-tag 'the-value)))
(assert-equal 'the-tag (type-tag data))
(assert-equal 'the-value (contents data))))
(test-case "Ex 2.77 -- apply-generic"
(define (op v) (+ 1 v))
(put 'add1 '(t1) op)
(let ((ten (attach-tag 't1 10)))
(assert-equal 11 (apply-generic 'add1 ten))))
(test-case "Ex 2.77 -- Scheme number package"
(let ((ten (make-scheme-number 10))
(eleven (make-scheme-number 11)))
(assert-equal (make-scheme-number 21) (add ten eleven))))
(test-case "Ex 2.77 -- Rational Numbers"
(let ((half (make-rational 1 2))
(third (make-rational 1 3)))
(assert-equal (make-scheme-number 1) (numer half))
(assert-equal (make-scheme-number 2) (denom half))
(assert-equal (make-rational 5 6) (add half third))))
(test-case "Ex 2.77 -- Rectangular Numbers"
(let ((x (make-from-real-imag 3 4)))
(assert-equal 3 (real-part x))
(assert-equal 4 (imag-part x))
(assert-equal 5 (magnitude x))
(assert-in-delta 0.927 (angle x) 0.01)))
(test-case "Ex 2.77 -- Polar Numbers"
(let ((x (make-from-mag-ang 5 0.927)))
(assert-in-delta 3 (real-part x) 0.01)
(assert-in-delta 4 (imag-part x) 0.01)
(assert-in-delta 5 (magnitude x) 0.01)
(assert-in-delta 0.927 (angle x) 0.01)))
(test-case "Ex 2.77 -- Complex/rectangular Numbers"
(let ((x (make-complex-from-real-imag 3 4)))
(assert-in-delta 3 (real-part x) 0.01)
(assert-in-delta 4 (imag-part x) 0.01)
(assert-in-delta 5 (magnitude x) 0.01)
(assert-in-delta 0.927 (angle x) 0.01)))
(test-case "Ex 2.77 -- Complex/polar Numbers"
(let ((x (make-complex-from-mag-ang 5 0.927)))
(assert-in-delta 3 (real-part x) 0.01)
(assert-in-delta 4 (imag-part x) 0.01)
(assert-in-delta 5 (magnitude x) 0.01)
(assert-in-delta 0.927 (angle x) 0.01)))
(test-case "Ex 2.77 -- Complex Number arithmetic 1"
(let ((x (make-complex-from-real-imag 3 4))
(y (make-complex-from-real-imag 9 12)))
(assert-equal (make-complex-from-real-imag 12 16) (add x y))))
(test-case "Ex 2.77 -- Complex Number arithmetic 2"
(let* ((x (make-complex-from-mag-ang 3 1))
(y (make-complex-from-mag-ang 4 1))
(result (add x y)))
(assert-in-delta 7 (magnitude result) 0.01)
(assert-in-delta 1 (angle result) 0.01)))